Junction-box for electrical conductors.



No. 665,676. Patented Jan. 8, l90l. E. T. GREENFIELD.

JUNCTION BOX FDR ELECTRICAL CONDUCTORS.

7 {Application filed July 9, 1900.) No Model.;

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UNITED STATES EDWIN T. GREENFIELD,

ATENT FFICE.

OF YORK, N. Y.

JUNCTION-BOX FOR ELECTRICAL CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 665,676, dated January8, 1901.

Application filedJuly 9,1900. s

To all whom it may concern:

Be it known that I, EDWIN T. GREENFIELD, acitizen of the United States,residing at New York, borough of Manhattan, county of New York and Stateof New York,have made a new and useful Improvement in Junction-BoxesforElectrical Conductors, of which the following is a specification.

My invention is directed particularly to improvements in junction-boxeslike those disclosed in prior United States Patents, No. 642,521,granted to me on the 30th of January, 1900, and No. 651,484, granted tome on the 12th day of June, 1900.

I have found in connection with the manufacture and use of two-part castjunctionboxes, one of said parts having integral disks which aredetached by breaking them down or out, as disclosed in thebefore-mentioned patents, that it often occurs that the box is brokenand therefore rendered practically useless. I have also found that inthe use of the box disclosed in United States Patent No. 651,484., wherethere is a relatively large number of openings in the bottom thereof,dust or dirt is liable to be admitted through said openings.

My present improvement has for its objects, first, the provision ofdetachable disks or cups inserted in the holes or openings for theconduit and other tubes or pipes of metallic junction-boxes, whichdetachable disks are made,preferably,in the form of thin metallic cups,and, second, the provision of a thin false bottom which may be appliedto one of the surfaces of that portion of the junctionbox which issecured to the wall, the function of said bottom being to effectuallyclose up all the openings therein which are not actually used, and thusavoid the ingress of dust or dirt.

Referring now to the drawings for a full and clearunderstanding of myimprovement, such as will enable others skilled in the art to constructand use the same,Figure 1 is apart plan, part sectional view of my noveljunction-box; and Fig. 2 is a sectional View of the same, taken throughthe body of the box on the line y y, Fig. 1, and as seen looking thereatfrom the top toward the bottom of the drawings. Fig. 2 is a perspectiveView of one of the detachable disks or cups.

Referring now to the drawings, A repreerial No. 22,953. (No model.)

sents the outer and B the inner half of a twopart junction-box made,preferably, of cast metal and each provided with outwardly-extendinghalf-necks N N N and N N coneshaped within from the outer to the innerends thereof, the arrangement being such that when the two parts of thebox are secured together by screws S tubular cone-shaped inlets areprovided for the inner ends of the conduit tubes or pipes to beconnected with the box.

O is a supporting-neck for the fixture-canopy, the same being integralwith the outer half A.

S S S are set-screws adapted to permanently secure the ends of theconduit tubes or pipes in placewhen once located in position.

D D D are metallic disks or cups, illustrated in perspective view inFig. 2 and adapted when put in position, as shown in Figs.t1 and 2, toeffectually close all of the inlets in the necks N N N N N H H are holesor openings in the bottom of the box, there being provided also a seriesof lugs L in the bottom of the box located beneath the inner ends of thenecks N, as shown on the right and left, Fig. 1, the function of saidlugs being for the purpose of securing the inner ends of the conduittubes or pipes by wire in the same manner as disclosed in my priorpatent,No. 651,484,above referred to. For the .purpose of effectuallyclosing up the bottom of the box, so as to prevent any ingress of dustor dirt through the screwholes and the slots formed around the aforesaidlugs, I provide a thin false bottom P, made, preferably, of preparedpaper, and secure the same to the box by rivets, as shown, it being aneasy matter for the workman putting the box in place to puncture thisfalse bottom through the openings in the regular bottom B, as desired,thereby insuring an absolutely'dust-tight box. In the use of this formof box the lower half thereof is secured in place by screws, asdescribed, after which the ends of the desired inleading-conduits areput in place in the cone-shaped necks N and the outer half of the boxsecured by the screws S. (See Fig. 2.) The detachable disks or cups Dare then driven into position in the unused necks, as shown, and in theevent of its becoming necessary to add in the future any additionalconduit tubes or pipes it is only necessary to remove such of the disksD as may be required.

The generic novelty of my invention lies in the construction of ajunction-box having inleading necks or inlets in combination withdetachable disks or cups adapted to close such of said inleading necksor inlets as may not be needed at the time of putting the box in placeand making the same available for the insertion of furtherconduit-tubes, as the necessities of the case may demand.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is

1. A junction-box provided with necks and means for securing the ends ofthe conduit tubes or pipes; in combination with detachable disks or cupsfor closing the same, substantially as described.

2. A two-part junction-box having halfnecks or inlets for supporting orsustaining the ends of the conduit tubes or pipes; in combination withdetachable disks or cups for closing the necks or inlets; together withmeans for securing the ends of the conduits to the box, substantially asdescribed.

3. A junction-box provided with a number of openings in its bottom; incombination with a thin false bottom adjacent thereto, substantially asdescribed.

4. A two-part junction -boX, one. part of which is provided with anumber of openings and a series of half-necks, the other part be- 1 ingprovided with a neck for supporting the fixture-canopy and acorresponding series of half-necks; in combination with a thin falsebottom adjacent to the first-named part, sub stantially as described.

5. A two-part junction-box, one part of which is provided with a numberof openings and a series of half-necks, the other part being providedwith a neck for supporting the fixture-canopy and a corresponding seriesof half-necks; in combination with a thin false bottom adjacent to thefirst-named part and a series of detachable disks or cups adapted toclose the ends of the necks, substantially as described. 6

6. A junction-box provided with a series of cone-shaped inlets, incombination with a series of detachable disks adapted to be inserted insaidinlets from the outer ends thereof, substantially as described andshown.

7. A two-part junction-box provided each with a series of half-necks orinlets coneshaped interior-1y from the outer toward the inner endsthereof and means for securing them together; in combination with aseries of detachable disks adapted to be inserted in the outer ends ofsaid cone-shaped necks or inlets, substantially as described.

In testimony whereof I have hereunto subscribed my name this 6th day ofJuly, 1900.

EDWIN T. GREENFIELD.

Witnesses:

O. J. KINTNER, WV. T. RUETE.

